Electrocatalytic oxidation behavior of NADH at Pt/Fe_3O_4/reduced-graphene oxide nanohybrids modified glassy carbon electrode and its determination

摘要

We have developed Pt/Fe_3O_4/reduced-graphene oxide nanohybrids modified glassy carbon (Pt/Fe_3O_4/RGO/GC) electrode as a novel system for the preparation of electrochemical sensing platform. Characterization of as-made composite was determined using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), transmission electron microscopy (TEM), atomic force microscopy (AFM) and energy-dispersive analysis of X-ray (EDAX) where the Pt, Fe, Si, 0 and C elements were observed. The Pt/Fe_3O_4/RGO/GC electrode was characterized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (E1S). Due to the synergistic effect between Pt, Fe_3O_4 and RGO, the nanohybrid exhibited excellent performance toward dihydronicotinamide adenine dinucleotide (NADH) oxidation in 0.1 M phosphate buffer solution, pH 7.0, with a low detection limit of 5 nM.